Years ago, when I worked for a living (as a carpenter), I would mark out hinges with a light knife cut from a Stanley 299 utility knife. I could make a more precise layout with my knife then you could with a butt marking gage. Today I would use a single bevel knife, light chisel cuts & clean out with a #71 router plane.
The 299 was a fixed blade, aluminum checkered handle. I would keep the same blade in for weeks on end, simply honing instead of changing it (even though the blades were disposable).